Optical recording medium, process for producing recording medium, and information recording method

A process for producing an optical recording medium, comprising the steps of;

• laminating a protective substrate provided with an adhesive layer to a recording layer formed on a substrate, in such a way that said recording layer comes into contact with said adhesive layer, and;
• applying thermal press bonding to integrate said substrate and said protective substrate;
• wherein said adhesive layer contains at least one copolymer selected from the group consisting of an ethylene-acrylic acid copolymer, an ethylene-acrylate copolymer, an ethylene-methacrylic acid copolymer and an ethylene-methacrylate copolymer, and has a Vicat softening point of from 65.degree. C. to 95.degree. C.

An optical recording medium comprising two substrates each having a recording layer formed thereon, said substrates being bonded in such a way that said recording layers face to each other interposing an adhesive layer, wherein said adhesive layer contains at least one copolymer selected from the group consisting of an ethylene-acrylic acid copolymer, an ethylene-acrylate copolymer, an ethylene-methacrylic acid copolymer and an ethylene-methacrylate copolymer, and has a Vicat softening point of from 65.degree. C. to 95.degree. C.

An information recording method comprising;

• irradiating an optical recording medium comprising a substrate, a recording layer and a protective substrate laminated to said recording layer interposing an adhesive layer, with a recording light beam to form pits in said recording layer to record information therein;
• said adhesive layer containing at least one copolymer selected from the group consisting of an ethylene-acrylic acid copolymer, an ethylene-acrylate copolymer, an ethylene-methacrylic acid copolymer and an ethylene-methacrylate copolymer, and having a Vicat softening point of from 65.degree. C. to 95.degree. C.